What is the meaning of gob smitten?

"Gob smitten" is a British colloquial expression that means to be astonished or amazed, often to the point of being speechless. The term "gob" refers to the mouth, so being "gob smitten" implies that someone is so taken aback that they can't articulate a response. It conveys a sense of surprise or disbelief at something unexpected.